package kz.kstu.aecdemo.desktop.util.health;

import java.awt.AWTEvent;

import java.awt.EventQueue;
import java.lang.reflect.UndeclaredThrowableException;

/**
 * Class works as proxy for event query for intercept exceptions purpose.
 *
 * @author Siarhei_Yarkavy
 *      created: 05.10.2009
 *
 */
public class EventQueueProxy extends EventQueue {

    private static final int FULL_DISPOSED = 0;

    private static final int CAPTURED = 2;

    private static final int SEMI_DISPOSED = 1;

    private static int state;

    /**
     * {@inheritDoc}
     */
    protected void dispatchEvent(AWTEvent newEvent) {
        try {
            super.dispatchEvent(newEvent);
        } catch (Throwable t) {
            //avoid recursion deadlock
            if (getState() == FULL_DISPOSED) {
                setState(CAPTURED);
                try {
                    DefaultErrorHandler.handleError(t);
                } finally {
                    setState(SEMI_DISPOSED);
                }
                setState(FULL_DISPOSED);
            } else {
                if (getState() == SEMI_DISPOSED) {
                    setState(FULL_DISPOSED);
                }
                if (RuntimeException.class.isAssignableFrom(t.getClass())) {
                    throw (RuntimeException) t;
                }
                throw new UndeclaredThrowableException(t);
            }
        }
    }

    private static synchronized int getState() {
        return state;
    }

    private static synchronized void setState(int state) {
        EventQueueProxy.state = state;
    }
}

